Input: ti_am335x_tsc - prevent system suspend when TSC is in use

Prevent system suspend while user has finger on touch screen,
because TSC is wakeup source and suspending device while in use will
result in failure to disable the module.
This patch uses pm_stay_awake() and pm_relax() APIs to prevent and
resume system suspend as required.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index a8c828de723cafa1ed9045eeb61b9a04b22083ab..b86c1e5fbc115dcbd30082919ae6c12f2b4e4ea2 100644 (file)
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -276,6 +276,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
        if (status & IRQENB_HW_PEN) {
                ts_dev->pen_down = true;
                irqclr |= IRQENB_HW_PEN;
+               pm_stay_awake(ts_dev->mfd_tscadc->dev);
        }
 
        if (status & IRQENB_PENUP) {
@@ -285,6 +286,7 @@ static irqreturn_t titsc_irq(int irq, void *dev)
                        input_report_key(input_dev, BTN_TOUCH, 0);
                        input_report_abs(input_dev, ABS_PRESSURE, 0);
                        input_sync(input_dev);
+                       pm_relax(ts_dev->mfd_tscadc->dev);
                } else {
                        ts_dev->pen_down = true;
                }
@@ -517,6 +519,7 @@ static int __maybe_unused titsc_resume(struct device *dev)
                titsc_writel(ts_dev, REG_IRQWAKEUP,
                                0x00);
                titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
+               pm_relax(ts_dev->mfd_tscadc->dev);
        }
        titsc_step_config(ts_dev);
        titsc_writel(ts_dev, REG_FIFO0THR,